package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2，如果不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4，保存验证码道session
//        session.setAttribute("code",code);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码

        log.debug("发送短信验证码成功，验证码：{}",code);
        //6.返回ok

        return Result.ok();
    }

    /**
     * 登录
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //校验一下手机号和验证码
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2，如果不符合返回错误信息
            return Result.fail("手机号格式错误");
        }

        //从redis中获取code
        String cachecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();

        if (cachecode==null || !cachecode.equals(code)){
            //不一致报错
            return Result.fail("验证码错误");
        }
        //
        User user = query().eq("phone", phone).one();
        if (user == null) {
            user = createUserWithPhone(phone);
        }

        //7.保存用户到redis中
        //7.1 随机生成token,作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2 将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions
                .create().setIgnoreNullValue(true).
                setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //7.3 存储
        String token_key = LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(token_key,userMap);
        //7.4设置token的有效期
        stringRedisTemplate.expire(token_key,30,TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }

    /**
     * @return
     */
    @Override
    public Result sign() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //写入redis
        Boolean b = stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    /**
     * @return
     */
    @Override
    public Result signCount() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();

        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num==0){
            return Result.ok(0);
        }

        int count=0;
        while(true){
            if ((num&1)==0) {
                break;
            }else{
                count++;
            }
            num >>>= 1;
        }
        return Result.ok(count);
    }
}
